<template>
  <div class="add-role">
    <header class="add-header">
      <div class="left">
        <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>

        <span>|</span>

        <span>{{id ? '编辑角色' : '添加角色'}}</span>

      </div>

      <div class="right">
        黑马程序员
      </div>

    </header>

    <main class="add-main">
      <div class="step-container">
        <el-steps direction="vertical" :active="activeStep">
          <el-step title="角色信息" />
          <el-step title="权限信息" />
          <el-step title="检查并完成" />
        </el-steps>

      </div>

      <div class="form-container" v-show="activeStep === 1">
        <div class="title">角色信息</div>

        <div class="form">
            <el-form ref="roleForm" class="form-box" :model="roleForm" :rules="roleRules">
                <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="roleForm.roleName" />
                </el-form-item>

                <el-form-item label="角色描述">
                <el-input v-model="roleForm.remark" />
                </el-form-item>

            </el-form>

        </div>

      </div>

      <div class="form-container" v-show="activeStep === 2">
        <div class="title">权限配置</div>
        <div class="tree-wrapper">
            <div v-for="item in treeList" :key="item.id" class="tree-item">
            <div class="tree-title">{{ item.title }}</div>
            <!-- show-checkbox展示复选框
            default-expand-all默认展开
            check-strictly解除父子级关联 -->
            <el-tree
                ref="tree"
                :data="item.children"
                show-checkbox
                default-expand-all
                node-key="id"
                highlight-current
                :props="defaultProps"
                check-strictly
            />
            </div>

        </div>

      </div>

      <div v-show="activeStep === 3" class="form-container">
        <div class="title">检查并完成</div>

            <div class="form">
                <div class="info">
                    <div class="form-item">角色名称：{{ roleForm.roleName }}</div>

                    <div class="form-item">角色描述：{{ roleForm.remark }}</div>

                    <div class="form-item">角色权限：</div>

                    <div class="tree-wrapper">
                        <div v-for="item in treeList" :key="item.id" class="tree-item">
                        <div class="tree-title">{{ item.title }}</div>

                        <el-tree
                            ref="disabledTree"
                            :data="item.children"
                            show-checkbox
                            default-expand-all
                            node-key="id"
                            :highlight-current="false"
                            :props="{ label: 'title', disabled:() => true}"
                        />
                        </div>

                    </div>

                </div>

            </div>

        </div>


    </main>

    <footer class="add-footer">
      <div class="btn-container">
        <el-button @click="prev" v-show="activeStep!==1">上一步</el-button>

        <el-button type="primary" @click="next" v-show="activeStep!==3">下一步</el-button>
        <el-button type="primary" v-show="activeStep===3" @click="confirmAdd">确认添加</el-button>
      </div>

    </footer>

  </div>

</template>

<script>
import { getTreeListAPI, createRoleUserAPI, getRoleDetailAPI, updateRoleAPI } from '@/api/role'
export default {
    name: 'AddRole',
    data() {
        return{
            activeStep: 1,
            roleForm: {
                roleName: '',
                remark: '',
                perms: []
            },
            roleRules:{
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' }
                ],
                remark: [
                    { required: true, message: '请输入描述名称', trigger: 'blur' }
                ]
            },
            treeList: [],
            defaultProps: {
                label: 'title'
            }
        }
    },
    computed: {
        id() {
            return this.$route.query.id
        }
    },
    created() {
        this.getTreeList()
        if (this.id) {
            this.getRoleDetail()
        }
    },
    methods: {
        //回显数据
        async getRoleDetail() {
            const res = await getRoleDetailAPI(this.id)
            this.roleForm = res.data
            //回显第二步的树状结构的勾选状态
            this.$refs.tree.forEach((item, index) => {
                item.setCheckedKeys(this.roleForm.perms[index])
            })
        },
        //创建角色
        async confirmAdd() {
            //添加还是编辑选择
            if (this.id) {
                delete this.roleForm.userTotal
                await updateRoleAPI(this.roleForm)
                this.$message.success('编辑成功')
            } else {
                await createRoleUserAPI(this.roleForm)
                this.$message.success('添加成功')
            }
            this.$router.back()
        },
        //获取所有的权限列表
        async getTreeList() {
            const res = await getTreeListAPI()
            this.treeList = res.data
        },
        //上一步
        prev() {
            if (this.activeStep === 1) return
            this.activeStep--
        },
        //下一步
        next() {
            if (this.activeStep === 3) return
            //第一步的统一校验
            if (this.activeStep === 1) {
                this.$refs.roleForm.validate(flag => {
                    if (!flag) return
                    this.activeStep++
                })
            } else if (this.activeStep === 2) {
                //在进行下一步之前需要加一些判断，如果用户勾选了权限信息进行下一步
                const treeComponentList = this.$refs.tree
                //每次点击下一步之前，先清空perms中原有的数据
                this.roleForm.perms = []
                treeComponentList.forEach(tree => {
                    this.roleForm.perms.push(tree.getCheckedKeys())
                })
                if (this.roleForm.perms.flat().length <= 0) {
                    this.$message.warning('还没有勾选权限信息')
                    return
                }
                const disabledTreeList = this.$refs.disabledTree
                disabledTreeList.forEach((tree, index) => {
                    tree.setCheckedKeys(this.roleForm.perms[index])
                })
                this.activeStep++
            }
        }
    }
}
</script>

<style scoped lang="scss">
.add-role {
  background-color: #f4f6f8;
  height: 100vh;

  .add-header {
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    height: 64px;
    line-height: 64px;
    font-size: 16px;
    font-weight: bold;
    background-color: #fff;

    .left {
      span {
        margin-right: 4px;
      }

      .arrow {
        cursor: pointer;
      }
    }

    .right {
      text-align: right;
    }
  }

  .add-main {
    position: fixed;
    top: 64px;
    bottom: 88px;
    width: 100%;
    overflow-y: auto;
    background: #f4f6f8;
    padding: 20px 230px;
    display: flex;
    .step-container {
      height: 400px;
      width: 200px;
    }
    .form-container {
      flex:1;
      background-color: #fff;
      overflow-y: auto;
      .title {
        height: 60px;
        line-height: 60px;
        padding-left: 20px;
      }
      .form {
        margin-bottom: 20px;
        padding: 20px 65px 24px;
        .el-form {
          display: flex;
          flex-wrap: wrap;
        }
        .info{
          font-size:14px;
          color:#666;
          .form-item{
            margin-bottom:20px;
          }
        }
      }
      .form-box{
        width: 600px;
        display: flex;
        flex-direction: column;
      }
    }
  }

  .add-footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 24px 50px;
    color: #000000d9;
    font-size: 14px;
    background: #fff;
    text-align: center;
    z-index: 10001;
  }
  .tree-wrapper {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      .tree-item {
        flex: 1;
        padding: 0px 4px;
        text-align: center;
        .tree-title {
          background: #f5f7fa;
          text-align: center;
          padding: 10px 0;
          margin-bottom: 12px;
        }
      }
    }
}
</style>
